128063799986 has 4 divisors (see below), whose sum is σ = 192095699982. Its totient is φ = 64031899992.

The previous prime is 128063799973. The next prime is 128063799991. The reversal of 128063799986 is 689997360821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689997360821 = 1213 ⋅568835417.

It can be written as a sum of positive squares in only one way, i.e., 80744064025 + 47319735961 = 284155^2 + 217531^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32015949995 + ... + 32015949998.

Almost surely, 2^128063799986 is an apocalyptic number.

128063799986 is a deficient number, since it is larger than the sum of its proper divisors (64031899996).

128063799986 is an equidigital number, since it uses as much as digits as its factorization.

128063799986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64031899995.

The product of its (nonzero) digits is 70543872, while the sum is 68.

The spelling of 128063799986 in words is "one hundred twenty-eight billion, sixty-three million, seven hundred ninety-nine thousand, nine hundred eighty-six".